Harlech, Porthmadog & Bala - OS Explorer Map OL18. Showing part of the Snowdonia National Park. Sheet: OL18 (1:25000)
Active maps are encapsulated and are tough, durable and weatherproof. The maps are covered in a protective plastic coating that can be written on, so your favourite routes can be easily highlighted. They are also lightweight and compact; just right for the active map user.